diff --git a/io.c b/io.c
index cef43bf..f12646f 100644
--- a/io.c
+++ b/io.c
@@ -2305,6 +2305,7 @@ io_read(int argc, VALUE *argv, VALUE io)
     if (len == 0) return str;
 
     READ_CHECK(fptr);
+    SET_BINARY_MODE_WITH_SEEK_CUR(fptr);
     n = io_fread(str, 0, fptr);
     if (n == 0) {
 	if (fptr->fd < 0) return Qnil;
diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index 6f823c8..fd7b9fe 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -2222,4 +2222,15 @@ EOT
       end
     end
   end if /mswin|mingw/ =~ RUBY_PLATFORM
+
+  def test_read_with_length
+    with_tmpdir {
+      str = "ab\r\nc"
+      generate_file('tmp', str)
+      s = open("tmp", "r") {|f|
+        # read with length should be binary mode
+        assert_equal(str, f.read(5))
+      }
+    }
+  end if /mswin|mingw/ =~ RUBY_PLATFORM
 end